Array rebuild

We have replaced a 5x36GB Array with a 5x72GB on a ML370 server with Integrated Smart Array, backing up & restoring the server. After 4 days do not has finished rebuiling the array. The server is a file server with 140GB used, very busy.

There is a way to know where it's arrived with the background parity initialization ( ACU gave no info about), and if it' acceptable a similar time-frame or i have to start worrying...?